Changelog

All three context menus (contact list right-click, chat reaction menu, system tray) now display Segoe MDL2 Assets glyphs beside each item for faster visual scanning. Icons are rendered from the system font at runtime and automatically adapt to dark/light themes.

ContactListWindow remembers its position and size across restarts. ChatWindow remembers its size. Six new fields added to AppSettings: ContactListLeft, ContactListTop, ContactListWidth, ContactListHeight, ChatWindowWidth, ChatWindowHeight.

Files can be dragged directly onto the chat input area, triggering the same send path as the paperclip button. A DragOver visual accepts file drops and rejects anything else.

Red circle overlay with cumulative unread count on the taskbar button. Cleared when any chat opens. Rendered via DrawingVisual → RenderTargetBitmap — zero polling cost.

Debounced "X is typing…" notice on the peer's side for direct chats. Sent at most once per 2 seconds; auto-hides 3 seconds after the last packet. Not shown in group chats.

Right-click a bubble → React → choose from 👍 ❤️ 😂 😮 😢 👎. Reactions are sent to the peer/group, persisted in a new MessageReactions table, and shown as pill badges below the bubble.

SearchMessagesAsync uses an SQLite FTS5 virtual table with INSERT/DELETE triggers for automatic indexing. Falls back to LIKE on older databases. Far faster than a plain LIKE scan on large histories.

TcpMessagingService packet-to-enum switch was missing the "typing" entry; it fell through to MessageType.Text, creating a blank bubble. Fixed.

Same switch missing "reaction" caused the JSON payload to render as a text bubble. Fixed.

Second launch now signals the running instance via a named pipe to bring its window to front, then exits silently. Mutex stored in a static field to prevent GC collection in async context; AbandonedMutexException is caught so a crash-then-restart works cleanly.

When a new peer is seen for the first time (UDP discovery), the receiving app now immediately unicasts its own presence packet back to the new peer. An admin starting after all users are running gets all peer IPs within milliseconds instead of waiting up to 10 seconds for the next broadcast cycle.

NameToInitialsConverter now returns the first two letters for single-word names ("Alice" → "AL"), matching User.AvatarInitials in the contact list.

Received messages in group chats show the sender's name above the bubble (hidden in direct chats via MultiDataTrigger).

Mini-avatar initials font size increased from 11 → 13 px to match the contact list.

The CPU/RAM/network display has been removed from the contact list footer. ResourceMonitorService no longer runs continuously; it is still available in Settings.

While a session is active, subsequent requests to the same peer focus the existing window rather than sending a new request.

AES-256 encrypted peer-to-peer messaging over TCP with message receipts (sent/delivered/seen), offline message queueing, and broadcast to all peers.

Send any file type with inline image previews. Files organized into categories in the download folder.

Full screen share with mouse and keyboard remote control. Multiple simultaneous sessions. H.264 MP4 recording via FFmpeg.

Named groups with member management, real-time join notifications, and group-wide file and screen sharing.

Silent screen monitoring locked behind SHA-256 passphrase. View-only mode, no notification on monitored device.

Full WPF theme system with live switching. Custom bubble colours, persistent per-user settings.

AES-256 encrypted .elmbackup export/import for full message and settings portability.

Enable PRAGMA journal_mode=WAL for better concurrent read performance and crash safety.

Re-hash admin passphrase with PBKDF2 (100,000 iterations, SHA-256). Transparent upgrade on next unlock.

Global AppDomain.UnhandledException and DispatcherUnhandledException hooks write structured crash logs. App offers to restart rather than silently terminating.

CRF 22 + -tune screen + -pix_fmt yuv420p for sharper screen content at equivalent file size.

TcpConnectionPool keeps one live TcpClient per peer, eliminating per-message SYN/FIN overhead under high volume (100-user target).

16×12 block grid diff; send 4-byte "no-change" sentinel when fewer than 5% of blocks changed. Expected bandwidth reduction: 50–80% for static desktops.

Per-sender monotonic sequence numbers; receiver discards duplicates using a sliding window to prevent message replay.

Replace GDI/BitBlt with GPU-based capture via DxgiFrameCapture. Reduces screen share CPU usage from ~30% to ~5% on modern hardware.

Auto-detect NVENC / QuickSync / AMF; fall back to libx264. Recording quality improved. UI shows "Recording (NVENC)" etc.

Every TCP connection derives a unique ephemeral AES-256 key via Elliptic-Curve Diffie-Hellman. Retiring the current static shared key.

Each packet carries a 32-byte HMAC tag. Tampered packets rejected before decryption using constant-time comparison.

Database encrypted with AES-256-CBC key derived from device ID + PBKDF2. Transparent to the application layer.

Replace ffmpeg.exe child-process with FFmpeg.AutoGen + Sdcb.FFmpeg.runtime.windows-x64 DLLs. Installer shrinks ~90 MB; removes SmartScreen warnings.

LanMessenger.Relay console app bridges peers on separate subnets when direct TCP fails. Peers fall back to relay automatically.